stannybboy

A Mario Paint reference appears in the Homestar Runner game "Dangeresque: The Roomisode Triungulate", where one of the random lines after a Game Over is "Undo Dog! Undo Dog!", referring to the Undodog character that debuted in that game and later also appeared in the Super Mario Maker games.

The choice to reference Mario Paint specifically may be due to the very first Homestar Runner animation being made in Mario Paint in 1996 (four years prior to the official launch of the website), to acknowledge its part in the series' history.